anonymous 4 years ago How do I find the fraction of a number?

1. anonymous

Here are the problems: 1/2 of 16 1/4 of 12 1/4 of 20 2/3 of 9 1/10 of 50 2/3 of 24

2. Mertsj

Remember that of means times

3. phi

I'll do the first one. $\frac{1}{2} \text{ of }16= \frac{1}{2}\cdot\frac{16}{1}= \frac{16}{2}= 8$

4. anonymous

Can you explain?

5. anonymous

How would I multiply them?

6. phi

you multiply fractions by multiplying their tops, and then multiply their bottoms. if one of the numbers is a whole number, make its bottom a 1. See example above for 1/2 * 16

7. anonymous

So you just divide the whole number by the denominator?

8. phi

in these simple problems, that is what happens. But see what happens when you get to 2/3 of 9

9. anonymous

2/3 of 9 = 3?

10. phi

2/3 of 9 is the same as $\frac{2}{3}\cdot \frac{9}{1}$

11. phi

multiply tops multiply bottoms divide